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// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -verify %s
// Tests for c11 atomics. Many of these tests currently yield unknown
// because we don't fully model the atomics and instead imprecisely
// treat their arguments as escaping.
typedef unsigned int uint32_t;
typedef enum memory_order {
memory_order_relaxed = __ATOMIC_RELAXED,
memory_order_consume = __ATOMIC_CONSUME,
memory_order_acquire = __ATOMIC_ACQUIRE,
memory_order_release = __ATOMIC_RELEASE,
memory_order_acq_rel = __ATOMIC_ACQ_REL,
memory_order_seq_cst = __ATOMIC_SEQ_CST
} memory_order;
void clang_analyzer_eval(int);
struct RefCountedStruct {
uint32_t refCount;
void *ptr;
};
void test_atomic_fetch_add(struct RefCountedStruct *s) {
s->refCount = 1;
uint32_t result = __c11_atomic_fetch_add((volatile _Atomic(uint32_t) *)&s->refCount,- 1, memory_order_relaxed);
// When we model atomics fully this should (probably) be FALSE. It should never
// be TRUE (because the operation mutates the passed in storage).
clang_analyzer_eval(s->refCount == 1); // expected-warning {{UNKNOWN}}
// When fully modeled this should be TRUE
clang_analyzer_eval(result == 1); // expected-warning {{UNKNOWN}}
}
void test_atomic_load(struct RefCountedStruct *s) {
s->refCount = 1;
uint32_t result = __c11_atomic_load((volatile _Atomic(uint32_t) *)&s->refCount, memory_order_relaxed);
// When we model atomics fully this should (probably) be TRUE.
clang_analyzer_eval(s->refCount == 1); // expected-warning {{UNKNOWN}}
// When fully modeled this should be TRUE
clang_analyzer_eval(result == 1); // expected-warning {{UNKNOWN}}
}
void test_atomic_store(struct RefCountedStruct *s) {
s->refCount = 1;
__c11_atomic_store((volatile _Atomic(uint32_t) *)&s->refCount, 2, memory_order_relaxed);
// When we model atomics fully this should (probably) be FALSE. It should never
// be TRUE (because the operation mutates the passed in storage).
clang_analyzer_eval(s->refCount == 1); // expected-warning {{UNKNOWN}}
}
void test_atomic_exchange(struct RefCountedStruct *s) {
s->refCount = 1;
uint32_t result = __c11_atomic_exchange((volatile _Atomic(uint32_t) *)&s->refCount, 2, memory_order_relaxed);
// When we model atomics fully this should (probably) be FALSE. It should never
// be TRUE (because the operation mutates the passed in storage).
clang_analyzer_eval(s->refCount == 1); // expected-warning {{UNKNOWN}}
// When fully modeled this should be TRUE
clang_analyzer_eval(result == 1); // expected-warning {{UNKNOWN}}
}
void test_atomic_compare_exchange_strong(struct RefCountedStruct *s) {
s->refCount = 1;
uint32_t expected = 2;
uint32_t desired = 3;
_Bool result = __c11_atomic_compare_exchange_strong((volatile _Atomic(uint32_t) *)&s->refCount, &expected, desired, memory_order_relaxed, memory_order_relaxed);
// For now we expect both expected and refCount to be invalidated by the
// call. In the future we should model more precisely.
clang_analyzer_eval(s->refCount == 3); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(expected == 2); // expected-warning {{UNKNOWN}}
}
void test_atomic_compare_exchange_weak(struct RefCountedStruct *s) {
s->refCount = 1;
uint32_t expected = 2;
uint32_t desired = 3;
_Bool result = __c11_atomic_compare_exchange_weak((volatile _Atomic(uint32_t) *)&s->refCount, &expected, desired, memory_order_relaxed, memory_order_relaxed);
// For now we expect both expected and refCount to be invalidated by the
// call. In the future we should model more precisely.
clang_analyzer_eval(s->refCount == 3); // expected-warning {{UNKNOWN}}
clang_analyzer_eval(expected == 2); // expected-warning {{UNKNOWN}}
}
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